let getAllBooks = () => axios.get('http://192.168.14.86:3000/books')
let deleteBook = (id) => axios.delete('http://192.168.14.86:3000/books?id=' + id)
let addBook = (bookname, author) => axios.post('http://192.168.14.86:3000/books', {
  bookname: bookname,
  author: author
})